There is a huge, farm equipment salvage yard up in Iowa Falls, Iowa.I Believe it's called Worthingtons,
In US call 1-888-845-8456. Here's their website
http://www.worthingtonagparts.com/Low/default.aspx Been buy there many times and it's one of the biggest places I've seen. Also there's Cook Tractor salvage in Clinton, MO.
Tractor Parts call Jim, Stan, or Linnette at (800) 769-5823 might try them too. If they can't help, ask if anyone else they might know. Salvage yards are usually hooked up via a locator to help find parts.